BIOL 371 Lecture Notes - Lecture 6: Blastula, Body Cavity, Diploblasty

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o Allows us to define other axes
Anterior (front) vs posterior( back)
Dorsal (back) vs ventral (front)
o Humans are triploblastic
Body cavities (coelom) of Bilateral
o Only in trophoblasts
o Cavity within the mesodermal tissue layer
Outside of the gut
Within the innermost layer
o Beause oelo is esoderal ad diplolasts do’t have esoderal layer
o Purpose
Fluid transport within the organisms
Provides a space to grow tissues at specific times of the year
Example gonads
Makes a good hydrostatic skeleton
To change the ody’s shape
Good for absorbing shock
Buffers internal organs from shock
Does not apply to diploblasts
Acoelomate
No coelom
Pseudocoelomate
False coelom
Not a cavity strictly within the mesodermal tissue layer
Body cavity that is not completely lined by the mesoderm
Body cavity is in contact with endoderm
Coelomate/eucoelomate
Fluid-filled cavity that is completely lined by the mesoderm
o Only comes into contact with mesoderm
Even lined endoderm
Body cavity that is completely lined by the mesoderm
o Body cavity is not in contact with the endoderm
o Developmental patterns
Diploblasts
Zygote
8-cell stage
Blastula
Gastrula
Triploblasts
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